I don't think either of the boats I've owned had a filter (mastercraft prostar, sanger v210). There's a bronze looking strainer under the boat to make sure you don't pull anything big in. Maybe swim under and see if it's plugged? Make sure the boat is off and you know what you're doing, there are skags, prop, strut, rudder, etc., under there you can get caught on. Better to pull it out and look.
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